/*
	Background Stretcher jQuery Plugin
	© 2009 ajaxBlender.com
	For any questions please visit www.ajaxblender.com 
	or email us at support@ajaxblender.com
	
	Version: 1.2
*/

;(function($){
	/*  Variables  */
	var container = null;
	var allImgs = '', allLIs = '', containerStr = '';
	
	var element = this;
	var _bgStretcherPause = false;
	var _bgStretcherTm = null;
	
	$.fn.bgStretcher = function(settings){
		settings = $.extend({}, $.fn.bgStretcher.defaults, settings);
		$.fn.bgStretcher.settings = settings;
		
		function _build(){
			if(!settings.images.length){ return; }
			
			_genHtml();
			
			containerStr = '#' + settings.imageContainer;
			container = $(containerStr);
			allImgs = '#' + settings.imageContainer + ' IMG';
			allLIs = '#' + settings.imageContainer + ' LI';
			
			$(allLIs).hide();
			$(allLIs + ':first').show().addClass('bgs-current');
			
			if(!container.length){ return; }
			$(window).resize(_resize);
			
			if(settings.slideShow && $(allImgs).length > 1){
				_bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', settings.nextSlideDelay);
			}
			_resize();
		};
		
		function _resize(){
			var winW = $(window).width();
			var winH = $(window).height();
			var imgW = 0, imgH = 0;

			//	Update container's height
			container.width(winW);
			container.height(winH);
			
			//	Non-proportional resize
			if(!settings.resizeProportionally){
				imgW = winW;
				imgH = winH;
			} else {
				var initW = settings.imageWidth, initH = settings.imageHeight;
				var ratio = initH / initW;
				
				imgW = winW;
				imgH = winW * ratio;
				
				if(imgH < winH){
					imgH = winH;
					imgW = imgH / ratio;
				}
			}
			
			//	Apply new size for images
			if(!settings.resizeAnimate){
				$(allImgs).width(imgW).height(imgH);
				
				var scale = (imgW / 1024);
				var triggerNum = $.fn.bgStretcher.settings.no;
				for(i=1 ; i<triggerNum + 1 ; i++) {
					if($('#trigger'+i).is('*')) {
						var scaledWidth = $.fn.bgStretcher.settings['trigger'+i][0] * scale;
						var scaledHeight = $.fn.bgStretcher.settings['trigger'+i][1] * scale;
						//$('#trigger'+i).width( scaledWidth );
						//$('#trigger'+i).width( scaledWidth ).height( scaledHeight );
						$('#trigger'+i).css('left', $.fn.bgStretcher.settings['trigger'+i][2] * scale );
						$('#trigger'+i).css('top' , $.fn.bgStretcher.settings['trigger'+i][3] * scale );
					}
				}
			} else {
				$(allImgs).animate({width: imgW, height: imgH}, 'normal');
			}
		};
		
		function _genHtml(){
			var code = '<div id="' + settings.imageContainer + '" class="bgstretcher"><ul>';
			for(i = 0; i < settings.images.length; i++){
				code += '<li><img src="' + settings.images[i] + '" alt="" /></li>';
			}
			code += '</ul></div>';
			$(code).appendTo('body');
		};
		
		/*  Start bgStretcher  */
		_build();
	};
	
	$.fn.bgStretcher.play = function(){
       _bgStretcherPause = false;
       $.fn.bgStretcher._clearTimeout();
       $.fn.bgStretcher.slideShow();
       
	};
	
	$.fn.bgStretcher._clearTimeout = function(){
       if(_bgStretcherTm != null){
           clearTimeout(_bgStretcherTm);
           _bgStretcherTm = null;
       }
	}
	
	$.fn.bgStretcher.pause = function(){
	   _bgStretcherPause = true;
	   $.fn.bgStretcher._clearTimeout();
	};
	
	$.fn.bgStretcher.slideShow = function(){
		var current = $(containerStr + ' LI.bgs-current');
		var next = current.next();
		if(!next.length){
			next = $(containerStr + ' LI:first');
		}
		
		$(containerStr + ' LI').removeClass('bgs-current');
		next.addClass('bgs-current');
		
		next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );
		
		$.fn.bgStretcher.showLayer();
		
		if(!_bgStretcherPause){
		  _bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', $.fn.bgStretcher.settings.nextSlideDelay);
		}
	};
	
	$.fn.bgStretcher.getCurrentIndex = function() {
		var currentImg = $(containerStr + ' LI.bgs-current IMG').attr('src');
		var images = $.fn.bgStretcher.settings.images;
		index = jQuery.inArray(currentImg, images);
		//alert(index);
		return index;
	};
	
	$.fn.bgStretcher.showLayer = function() {
		currentIndex = $.fn.bgStretcher.getCurrentIndex();
		var slides = $.fn.bgStretcher.settings.slides;
		var currentSlide = slides[currentIndex];
		
		$('.slide').fadeOut('8000');
		$('.box').fadeOut('8000');
		$('.trigger').hide();
		
		$('#'+currentSlide).show();
		$('.trigger').fadeIn(4000);
		
	};
	
	$.fn.bgStretcher.loadSlide = function(i){
		currentIndex = $.fn.bgStretcher.getCurrentIndex();
		if (i != currentIndex + 1)
		{
			var current = $(containerStr + ' LI.bgs-current');
			var next = $(containerStr + ' LI:nth-child('+i+')');
			if(!next.length){
				throw new Exception("Invalid slide index")
			}
		
			$(containerStr + ' LI').removeClass('bgs-current');
			next.addClass('bgs-current');
		
			$.fn.bgStretcher.pause();
		
			next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
			current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );
		
			$.fn.bgStretcher.showLayer();
		
			if(!_bgStretcherPause){
			_bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', $.fn.bgStretcher.settings.nextSlideDelay);
			}
		}
	};
	
	/*  Default Settings  */
	$.fn.bgStretcher.defaults = {
		imageContainer:             'bgstretcher',
		resizeProportionally:       true,
		resizeAnimate:              false,
		images:                     [],
		slides:                     [],
		imageWidth:                 1024,
		imageHeight:                768,
		nextSlideDelay:             3000,
		slideShowSpeed:             'normal',
		slideShow:                  true
	};
	$.fn.bgStretcher.settings = {};
})(jQuery);